The SEL-849 Relay offers current-, voltage-, and thermal-based motor protection; arc-flash detection; and power metering. It also provides all basic motor protection features, including protection for the following conditions:
The SEL-849 installs easily inside a motor control center (MCC). The optional SEL-3421 and SEL-3422 Motor Relay HMIs (human-machine interfaces) install on the front of the MCC.
Motor Protection—Protect low- or medium-voltage three-phase induction and variable-frequency drive (VFD)-fed motors with an enhanced thermal model. Connect an external core-balanced current transformer (CBCT) to obtain sensitive ground-fault detection in high-impedance grounded systems.
Arc-Flash Mitigation—Improve worker safety using the SEL-849 Motor Management Relay’s built-in arc-flash detection (AFD). The AFD, supervised by overcurrent elements, delivers secure, reliable, and fast-acting arc-flash protection.
Feeder Protection—Configure flexible instantaneous and time overcurrent elements to protect feeder circuits.
Direct Connection—Connect up to 690 V to the optional voltage inputs and up to 256 FLA (full-load amperes) through the built-in CT primary circuits. Use external instrument transformers for higher voltages or currents.
Optional Human-Machine Interface (HMI)—Install SEL-849 Relays in motor control center (MCC) buckets, and connect the optional display modules (SEL-3421 or SEL-3422) outside the MCC for secure and safe relay access.
Metering and Monitoring—Analyze SER reports and oscillographic event reports for rapid commissioning, testing, and post-fault diagnostics. Reduce separately mounted metering/monitoring devices by taking advantage of the SEL-849 Relay’s motor start report, motor start trending, motor operating statistics, energy metering, minimum/maximum metering, and demand metering features.
Integration—Select from a variety of communications ports and protocols—IEC 61850, Modbus, SEL ASCII, and SNTP—to integrate SEL-849 Relays into supervisory or coordinated protection and control systems.
Multiple Applications—The SEL-849 Relay supports pumping applications for water, chemicals, and petroleum; air-based applications, including fans, blowers, air handlers, and compressors; chiller applications, such as compressors and air conditioning; and applications involving bulk materials, such as conveyors, crushers, screeners, feeders, augers, and bucket elevators. The SEL-849 can be configured as a motor, VFD motor, or feeder protection relay.
Low-voltage Feeder Protection—The SEL-849 includes a full set of instantaneous time and overcurrent elements that provide advanced low-voltage feeder protection:
Motor Control Centers (MCCs)—A primary application for the SEL-849 is for overload and arc-flash protection of MCCs. In this application, the SEL-849 operates the contactor, controlling the start and stop of the motor. The SEL-849 receives start/stop commands with IEC 61850 and Modbus protocols, contact inputs, or the remote HMI Start/Stop pushbuttons.
EIA-232 or EIA-485 provides quick and easy engineering access.
Optical sensor supports high-speed, secure arc-flash detection.
You can use spacesaving portals for motor conductors with a fullload ampere (FLA) rating range of 0.5–256 A or external CTs for an FLA rating of up to 6,000 A.
Optional direct-connect voltage inputs (allowing up to 690 Vac) enable voltage-based protection elements.
HMI powered Ethernet port lets you review status and event records externally to improve safety
EIA-232/EIA-485 serial or single/ dual Ethernet port(s), Modbus® RTU, Modbus TCP, and IEC 61850 provide flexibility to communicate with other devices and control systems.
Large LCD display for navigation, relay control, and diagnostics
Context-adjusted navigation keys
Two fixed and eight programmable tricolored LEDs
Fundamental motor controls
Simple HMI for status and control
Configurable label for programmable LEDs
Compact Design for Motor Control Centers (MCCs)
The compact form-factor 71.1 mm (2.8 in) X 127.0 mm (5 in) X 152.4 mm (6 in) easily installs in small MCC drawers and buckets. Built-in current transformers save room and reduce installation time.
Easy-to-Use Web Interface
The web interface makes it easy for electricians and technicians to configure and monitor the SEL-849.
Easy Integration With Control Systems
Several communications protocol options allow the SEL-849 to be used with old and new control systems. For maximum flexibility, the SEL-849 includes options for internally wetted or externally wetted contact inputs.
Arc-Flash Hazard Protection
MCCs typically have large fault-current potential, resulting in increased arc-flash hazards. The SEL-849 Relay’s arc-flash detection capability significantly reduces total arc-flash energy.
Standard Feature Set
Rugged Hardware You Can Rely On
All SEL relays are designed to operate in harsh environments where other relays may fail. The SEL-849 operates in extreme conditions, with an operating temperature of –40° to +85°C, and is designed and tested to exceed applicable standards, including vibration, electromagnetic compatibility, and adverse environmental conditions.
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